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Flat hollow brushless servo motor with tool mounting holeFlat hollow brushless servo motor with tool mounting hole description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060163955, Flat hollow brushless servo motor with tool mounting hole. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to an SPM-type brushless servomotor in which a ring magnet is used as a rotor, and particularly relates to a flat, hollow brushless servomotor whose length in an axial direction is short, and that is provided with a tool-mounting hole. BACKGROUND ART [0002] An example of a hollow brushless servomotor is disclosed in the patent document 1 listed below. In the motor cited therein, an encoder is disposed in a rear end portion of a motor output shaft, and a front-end portion of the hollow motor output shaft is adapted to be engaged with a load side via a reduction gear. PATENT DOCUMENT 1: JP-U 03-54352 DISCLOSURE OF THE INVENTION Problem to be Solved by the Invention [0003] An object of the present invention is to provide a flat, hollow brushless servomotor that is suitable for applications in which a tool is directly mounted on a rotational shaft of the motor and a workpiece is pressed from both sides thereof to carry out predetermined machining. Means of Solving the Problems [0004] A flat, hollow brushless motor of the present invention has: [0005] a flattened tubular motor housing sealed at both ends; [0006] first and second housing through holes formed in a center of first and second end plate portions on both sides of the motor housing; [0007] a rotor shaft of which a portion of both ends is exposed from the first and second housing through holes; [0008] a tool-mounting hole that extends through a center of the rotor shaft; and [0009] first and second workpiece insertion recesses formed in external surfaces of the first and second end plate portions of the motor housing; wherein [0010] the first workpiece insertion recess is formed in a circular area encompassing the first housing through hole, and in an area with a predetermined width extending in a radial direction to an external peripheral edge of the motor housing continuously with the circular area in the external surface of the first end plate portion; and [0011] the second workpiece insertion recess is formed in a circular area encompassing the second housing through hole, and in an area with a predetermined width extending to an external peripheral edge of the motor housing continuously with the circular area in the external surface of the second end plate portion. [0012] Here, the tool-mounting hole is preferably a hexagonal or another polygonal cross section. [0013] The maximum length in an axial direction of the rotor shaft is preferably equal to or less than the thickness between bottom faces of the first and second workpiece insertion recesses in the first and second end plate portions on both sides of the motor housing. [0014] Furthermore, the present invention preferably has a lead wire laying area extending to an outside in a radial direction from an external peripheral face of the motor housing, wherein lead wires disposed along a recess groove formed on an inside surface of the first or second end plate portion of the motor housing are brought out to the lead wire laying area. [0015] The present invention also preferably has a detection mechanism for detecting a motor magnetic pole position, wherein the detection mechanism comprises an FG magnet disposed on one end face of the rotor shaft, and a Hall element or another magnetic sensor disposed in an inside surface area of the first or second end plate portion facing the FG magnet in the motor housing. Effects of the Invention [0016] In the brushless motor of the present invention, first and second workpiece insertion recesses are formed extending in the radial direction on the external surface of the end plate portion on both sides of the motor housing, and the portions on which the recesses are formed are the thinnest portions in the axial direction in the motor housing. Since the hollow portion of the rotor shaft that has a length which allows it to be accommodated in the motor housing is used as the tool-mounting hole, the tool-mounting portion does not protrude in the axial direction from both sides of the motor housing. The lead wire laying area extends in the radial direction from the external peripheral face of the motor housing, and naturally does not protrude in the axial direction from both ends of the motor housing. Since the lead wires in the motor housing are brought out along the recess groove formed by reducing the thickness of the end plate portion of the motor housing, a space for bringing out the lead wires does not protrude in the axial direction from both ends of the motor housing. Additionally, a space for installing components for the detection mechanism is also provided in the motor housing by using a gap between the first or second end plate portion and the end face of the rotor shaft. Therefore, in accordance with the present invention, a hollow brushless servomotor provided with a very flat tool-mounting hole can be realized. [0017] Hence, the brushless servomotor with the tool-mounting hole of the present invention is suitable for use as a machine tool that carries out predetermined machining to facing portions of a workpiece provided with facing portions that face each other across a narrow space as follows. That is to say, the brushless servomotor is thin and can therefore be inserted between the facing portions that face each other across the narrow space in the workpiece. When a tool is mounted on the rotor shaft of the brushless servomotor, and in this state the facing portions of the workpiece are introduced along the first and second workpiece insertion recesses from the outside toward the tool at the center in the radial direction of the motor, a tip of the facing portions can be pressed to the tool. In this state, the brushless servomotor is rotatably driven, and predetermined machining can be carried out on the workpiece by means of the tool. Continue reading about Flat hollow brushless servo motor with tool mounting hole... Full patent description for Flat hollow brushless servo motor with tool mounting hole Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Flat hollow brushless servo motor with tool mounting hole patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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